Am 05.09.2018 um 07:37 schrieb Aki Tuomi:
On 04 September 2018 at 23:20 Robert Schetterer <r...@sys4.de> wrote:
Am 04.09.2018 um 18:27 schrieb Sami Ketola:
On 4 Sep 2018, at 18.38, Robert Schetterer <r...@sys4.de> wrote:
Sorry i migrated terrabytes of mail with imapsync and never had a
problem, it works as designed, also with maildir rsync did a good job,
what never worked as it should was dsync ,cause of bugs ,that may
changed now
I would like to very much hear about the problems you had with dsync as we have
successfully migrated tens of petabytes of mails with it successfully while
preserving the UID numbers.
Imapsync would have been totally out of question as it is absolutely crucial in
those migrations to keep the UID -> MAIL pairs matching legacy server. And
usually also POP3 UIDLs. If not keeping the data the servers would have literally
melted under load when switching over then of thousands of users forcing them to
redownload headers of even mail bodies for millions of mails.
Sami
I think you should know the dove buglist, i used dovecot since the beginning
and believe me dsync had a lot of problems, as i stated i hope this had
changed now. I didnt used/tested it again the last years cause i had no
big migration job to do, we ever tried to use it that days cause youre
right we would have prefer not broke pop3 stuff at migration. But it
never worked, so imapsync was the best way to go, also having courier,
cyrus migrations with format/namespace change etc.
Imapsync works as designed and migration might not be ideal at some
points but it has no real stoppers if migration is well prepared and
organized.
Best Regards
MfG Robert Schetterer
There has been progress with dsync in the past years, and it can do courier and cyrus
migrations with format/namespace changes. "Few years ago" is a long time.
we will give a retry end of this year and report
Aki
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[*] sys4 AG
https://sys4.de, +49 (89) 30 90 46 64
Schleißheimer Straße 26/MG,80333 München
Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief
Aufsichtsratsvorsitzender: Florian Kirstein
